export function cookie (name, value, options) {
  if (cookieIsEnable) {
    if (typeof value !== 'undefined') { // name and value given, set cookie
      options = options || {}
      if (value === null) {
        value = ''
        options.expires = -1
      }
      var expires = ''
      if (options.expires && (typeof options.expires === 'number' || options.expires.toUTCString)) {
        var date
        if (typeof options.expires === 'number') {
          date = new Date()
          date.setTime(date.getTime() + (options.expires * 24 * 60 * 60 * 1000))
        } else {
          date = options.expires
        }
        expires = '; expires=' + date.toUTCString(); // use expires attribute, max-age is not supported by IE
      }
      var path = options.path ? '; path=' + options.path : ''
      var domain = options.domain ? '; domain=' + options.domain : ''
      var secure = options.secure ? '; secure' : ''
      document.cookie = [name, '=', encodeURIComponent(value), expires, path, domain, secure].join('')
    } else { // only name given, get cookie
      var cookieValue = null;
      if (document.cookie && document.cookie !== '') {
        var cookies = document.cookie.split(';')
        for (var i = 0; i < cookies.length; i++) {
          var cookie = cookies[i].trim()
          // Does this cookie string begin with the name we want?
          if (cookie.substring(0, name.length + 1) === (name + '=')) {
            cookieValue = decodeURIComponent(cookie.substring(name.length + 1))
            break
          }
        }
      }
      return cookieValue
    }
  } else {
    alert('cookie 被禁用')
  }
}
function cookieIsEnable () {
  return window.navigator.cookieEnabled
}
